Down Pipe is a deep, slate grey with a green undertone, and the single best thing you can do with it is drench the room. Walls, woodwork, the ceiling — all the same colour, just varying the finish. Estate emulsion on the walls, estate eggshell on the joinery. You get depth and shadow without harsh contrast, and the green undertone reads beautifully in the changing light. This is the look that flatters Down Pipe most, and it's how I'd run with it nine times out of ten.
If you'd rather trim it out, the rule is simple: cool off-whites only. A warm cream beside Down Pipe fights its green-grey character and looks muddy. Reach for Farrow & Ball All White (LRV 92) or Strong White — crisp, clean, and they let Down Pipe sit calm and architectural rather than dingy. Blackened works too if you want a whisper more shadow in the white.
For accents, go deep and muted, never bright. Paint & Paper Library Blue Blood (LRV 16.4) is a gorgeous deep ink blue that picks up Down Pipe's coolness and adds a layer of richness — brilliant on a single piece of joinery or an alcove. A muted olive does the same job from the green side.
Want a controlled hit of warmth? Mylands Beehive Place No.140 (LRV 58.6) is a soft ochre-tinted neutral that lifts a Down Pipe scheme without cheapening it — a lovely choice for a rug, a lampshade or an adjacent connecting room.
And if you're feeling bold and the room can take it, a single accent of Dulux Fuchsia Falls 2 (LRV 29.8) used right back — a cushion, a chair — gives that designer punch of unexpected colour against all that grey. Use it sparingly, mate. The temptation with a dark grey is to over-decorate it. Resist. Down Pipe's strength is its restraint — let it be the quiet star and dress around it with one or two considered notes.